Spark plug



June 12, 1928. 1,673,592

7 M. SANDERS SPARK PLUG Filed Aug. 26, 1926 flak/7250191 7 Vii/less es.-

Patented June 12, 1 928. I a y y i:

N T D TATE P ENTOF I E- mammsam sw cnroaeo, rnnruors. y i

. mm; Prue. I v

Application filed-August 26, 1926. Serial No."131;612.

My invention relates to an improvement in spark" plugs, theinventionbeing more particularly related to an improved electrode constructionespecially designed for use as a repair attachmentfor spark plugs,

although it, is to be understood that my invention is not "confined tosuch use since the improved electrode constructioncan be made.

as a component partiofjthe spark plug in the first instance.

It is within the province of my invention to provide an electrodeconstruction capable of being quickly and conveniently applied to thecentral electrode of a customary type of spark plug embodying aconducting shell insulatively' carrying v a central electrode;

and further to provide the electrode con struction with an extendingpart which will occupy a position continuous in proximity with theperiphery of the conducting shell sothat sparks will be produced in acontinuous intervening spark gap to lnsure a more complete burning ofthe gas mixture in proximity to the end 16of the conducting shell so asto produce a continuous spark gap therewith, and the result of this ar-1 in the cylinder. Other objects will appear hereinafter. The inventionconsists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawing, forming a part of this specification, and in which, w

Fig. 1 represents a side elevational view of a spark plug equipped withmy improved electrode construction; 1 V

Fig. 2 represents a central longitudinal section of Fig.1; t

Fig. 3 representsa bottom plan view of Fig. 1, this view being taken ontheline 33 of 2; and v y Fig. 4 represents an enlarged perspective viewof my electrode construction. With more particular reference to theaccompanying drawing, wherein for the purpose of illustrating apractical application of my invention, I have shown a spark plug 5 ofordinary construction, the same including an outer conducting shell 6and a central electrode 7 which is insula-tively supported thereinthrough the instrumentality of a porcelain center piece 8 and a lockingsleeve 9.

My invention, in its preferred form of construction as illustrated inthe accompany.

comprises an attachment which be applied to the free end of ing drawing,is adapted to i be better understood, that in addition to the .7.Inasmuch as this angular. electrode as usually arranged, interferes withthe appliend 16 of the conducting shell; and in Fig. 2

the electrode 7 which for this" purpose,y

is madefwith a medialsleeve 10slit. longi tudinally as at v ll in orderto. have atight i blndlng grip onthe central electrode? when appliedthereon. rom whatI term the outer end orportion12 ofthis sleeve, anextending. portion 13 extends outwardly from anfiedge: of the stockwherethe slitll occurs, and supports a circular or encircling part 14 whichstands apart from the end of the slee ve, the extremity 15 of thecircular or encircling part 14 preferably terminating,

as best shown in Figs. .3 and 1, in spaced apart relation totheoutwardly extending, part 13 where it merges into the encircling part14. Preferably and as shown the encircling part. lt is held spaced fromthe sleeve 10 at such distance that it will occupy i a position oppositethe end 16 of the conducting shell 6 when the sleeve 10 is applied tothe central electrode? as best shown in Figs. 1, 2 and 3. By thisarrangement, the Q I encirclin g partll is supported continuouslyrangernent isthata field of electrical discharges or sparkswilltakeplace between the the end ;16 of the conducting shell wheneverthrough the employmentof the usual timing device the electrical currentis permitted tov i flow'through the central electrode 7.

a It is to be remarked here, in order that the mode of applying myattachment" may cation'of my improved electrode construction to the endof the central electrode 7,3it is necessary to removethat portion of thean-, gular electrode which protrudes from the of the accompanyingdrawlnglhave shown at 18 the embedded partor stub of an angularelectrode sheared off. even with the end 16 so as to enable theapplication of the sleeve 10 to the central electrodel.

s From the foregoing description and a study of the drawing it will beapparent inner edge 17 of the encircling part 'l l-and' that I haveprovided a very simple and inexpensive electrode construction, capableof being manufactured as a repair attachment which can be quickly andconveniently fixed on the central electrode when the spark plug fails tofunction properly owing to any impairment of its electrodes, and whichwhen applied will serve as means for insuringa more effective burning ofthe gas mixture in the cylinder.. It will be obvious that, if de--sired, the electrode construction of this in-- vention may bemade as'acomponent part of the central electrode in thefirst instance.

While I haveillustrated and described the preferred form of constructionfor'carrying my invention into effect, this is capable of variation andlmodification without de'-- parting from the spirit of the invention;- I

In testimony whereof I have signed my name to this specification.

MARTIN SANDERS.

